STANLEY 10-499 QUICKCHANGE RETRACTABLE BLADE UTILITY KNIFE DURABLE ALL-METAL KNIFE BODY CONSTRUCTION. QUICK ONE-BUTTON BLADE CHANGE - NO TOOLS REQUIRED. INTERLOCKING NOSE DESIGN HELPS SECURE BLADE AND HELPS PREVENT BODY SEPARATION. INTEGRATED STRING CUTTER WHEN BLADE IS RETRACTED. COMES WITH HANG-HOLE FOR ADDING A WRIST STRAP OR LANYARD. SWING-OUT BLADE STORAGE FOR EASY BLADE ACCESS. BLADES INCLUDED (11-921) 3. RETRACTABLE BLADE POSITIONS 3. WORKS WITH MOST STANDARD UTILITY BLADES. FOR USE WITH 11-921 MUST BE 18 YEARS OR OLDER TO PURCHASE THIS PRODUCT